A real big window on the top of the slide. The window width covers the flat top of the slide from .5" back to about .5" forward fo the barrel lugs.

A window this big is largely only possible on bushing barrel setups with a commander length bushing.

On bull barrel setups, the barrel would need to be fit first. This is so that I can measure where the cutback on the barrel contacts the inside of the slide so that I don't compromise fit dimensions.

Serrations visually lining up with the side serrations. This can be done with square or ball serrations, but is likely best looking with square.